Electric-current brush structure.



A.E.BERDOU.

ELECTRIC CURRENT BRUSH STRUCTURE.

APPLICATION FILED JULY 8, 1912.

Patented Aug. 12, 1913.

ALBERT E. BER-non, or LA FAYETTE, INDIANA.

ELECTRIC-CURRENT BRUSH STRUCTURE.

specification of Letters Patent.

Application filed July 8, 1912. Serial No. 708,332.

To all whom it may concern Be it known that I, ALBERT E. Brannon,citizen of the United States,residing at'La- Fayette. in the county ofTippecanoe and State of Indiana, have invented a certain new and usefulImprovement in Electric- Current Brush Structures, of which thefollowing is a full, clear, concise, and exact description, referencebeing had to theaccon'ipanying drawings, forming a part of tlnsspecification.

My invention relates to brushes-for conveying current to and fromrotating elements, such as the armatures of dynamo electricmachines,andhas for one of its objects the provision of means whereby the contactingelement of the brush structure may be removed and replaced very readily.

The invention has for another object the provision of means for limitingthe extent to which the contacting element, such as carbon, may be fedtoward the rotating member it engages whereby the holder for thecontacting element is prevented from engaging and injuring the rotatingelement.

The invention has further features and will be more fully explained byreference to the accompanying drawing showing its preferred embodimentand in which Figure 1 is an elevation partially in section, of a directcurrent: magneto equipped with two brush structures of my invention;Fig. 2 is a sectional view on line 2 2 of Fig. 1; Fig. 3 is a view online 3 3 of Fig. 1; Fig. 4 is a view on line 4 4i of Fig. 1; and Fig. 5is a perspective yiew of the holder for the contacting element.

Like parts of both brush structures shown in Fig. 1 and like parts inthe different figures are indicated. by similar characters of reference.

The frame work of the dynamo-electric machine supports two tubular brushguides 1 which are shown as being substantially radially disposed. Asshown in Fig. 2, the tubular guides are preferably rectangular incross-section, opposite walls of each guide being provided with twogrooves 2 that receive the longitudinal parallel edges of the wider wallofthe contacting element holder, whereby the contacting element isguided. in its movement. The holder of each brush structure ispreferably of the shape shown in Fig. 5. As illustrated, the holder ismade from a single plate from which opposite parallel walls of theholder are formed,

the carbon holder is 'ing element structure,

tenor of the guide and PatentedAug'.12,1913. r

they narrower of these walls being provided with insettlng ears 4 thatlimitthe extentv to which the contacting carbon block 5 may be insertedwithin the holder, whereby the. .relatlve position of carbon andholdermay readilybe determined. The metal ofwhich resilient to enablethe carbon to be held by spring pressure between the parallel wallsofthe holder.

Acoiled feeding spring 6 is'located within formed is sufficiently theguide and is interposed between an abut and the holder for the carboncontacting element 5 to press the carbon into contact. The extent 'towhich'the spring 6 may distend is limited .by a 'tie' member thatconnects the abutment 7 with the contacting element structure. This tiemember is preferably in the form of two links 8, each passing throughthe other, one link being attached 'to' the plate portion 3' of thecontactment 7 is secured to the abutment 7. By this construction the tiemember is contractible and extensible to permlt the spring 6 to beconwhile the other link tracted and to expand, the links being of suchlength as to stop the expansion of the I spring 6 before the carbonholder ha reached the commutator or other rotatiy/g body into engagementwith which the carbon is forced by the spring 6, whereby said holder isprevented from injuring the rotating member. In order to afford a goodseat for the spring against the abutment 7, said abutmefitis providedwith an annular, spring receiving, recess.

The abutment 7 desirably has sliding cngagement, as distinguished fromthreaded engagement, with the outer end of the associate guide 1, but Ido not wish to be limited to such sliding engagement. The abutment isheld in its seat alforded by the guide 1 by means of a bail 9 pivotedupon the exserving to engage the back of the abutment and hold it inplace againstthe pressure of the spring (3, as illustrated in Figs. 1,3, and 4:. When the bail is deflected laterally of the guide, theabutment is dislodged by the spring and the abutment, the spring, thecarbon block and block holder are withdrawn as a unit, the tie member 8serving toprevent separation of the abutment and carbon holder, while atthe same time keeping the spring in its interposition between the carbonholder and spring abutment. The bail is Having thus described myinvention I claim as new and desire to secure by Letters Patent thefollowing 1. A brush structure'including a contacting element; a holderfor the contacting element; aguide for the holder; a; spring within theguide for exerting pressure upon the contacting element; an. abutmentbetween which and the contacting element the spar-inn is interposed; anda tie member joining the holder and abutment for limiting the extent towhich the contact 'elementmay be moved by the pressure of the spring toprevent the holder from engaging the rotating part engaged bythecontacting element, said tie member being in the form of two linkspassing through each other, one.

link being secured to the holder while the other is secured to theabutment.

2. A brush structure including a contacting element; a guide fordirecting its movement; a spring within the guide for exert- 1ngpressure upon the contacting element; an abutment between which and thecontacting element the spring is interposed and which abutment hassliding engagement with the guide; and an abutment'retaining member.swingingly mounted upon the guide and adapted to engage the abutment tohold the same in place against the force of the spring.

3. A brush structure including a contacting element a guide fordirecting its movement; a spring within the guide for exerting pressureupon the contacting element; an abutment between which and thecontacting element the spring is interposed and which abutment is insliding relation with.

the guide and an abutment retaining mem-' ber mounted upon the guide andadapted separably to engage an outer end portion of the abutment to holdthe same in place against the force of the spring.

In witness whereof,- I hereunto subscribe my name this fifth day ofDecember A. D., 1911.

ALBERT E. BERDOlQ'.

Witnesses:

THoMAs DUNCAN, J.- W. 'ESEENTME.

